Act 3 often presents more complex vertical puzzles. You might need to use the Rocket to activate switches high above or to reach a series of platforms that crumble after a short time. One Red Star Ring could be at the very top of a tall structure, requiring multiple Rocket boosts or a combination with a spring. Another might be hidden behind a wall that can only be reached by a precise Rocket trajectory. Look for subtle visual cues indicating hidden paths or destructible elements. Remember to collect rings to protect yourself from environmental hazards.
